Crossword Genius

Old boy is to supply musician (6)

Ross

I believe the answer is:

oboist

'musician' is the definition.
(oboist is a kind of musician)

'old boy is to supply' is the wordplay.
'old boy' becomes 'ob'.
'supply' indicates anagramming the letters (supply of letters to make).
'is'+'to'='isto'
'isto' anagrammed gives 'oist'.
'ob'+'oist'='OBOIST'

(Other definitions for oboist that I've seen before include "Player of woodwind instrument of treble pitch" , "Do I boost the musician?" , "Wind player" , "orchestra member" , "Instrumentalist" .)

I've seen this clue in The Telegraph.
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